Airman Higgs got Baron Wulfenbach out of a burning airship and to safety. During which, he had to deal with a bunch of monsters, an irate Captain Dupree, and a goose, breaking three out of four limbs in the process and getting an infected bite. He managed to get to a town despite his injuries, where he got shot in his last undamaged limb. He informed the local garrison of Wulfenbach's predicament, then passed out.
Then shows up here and here fighting off a Muse that is possessed/occupied by the Heterodyne Castle's AI.
Sollux does it again when he telekinetically flies the troll's asteroid toward the beacon of the Green Sun, their only hope of survival, at the rapid speed necessary to get there before the beacon's path fades. The strain is so great that he bleeds from every orifice before ultimately dying permanently of it.
Terezi Pyrope also deserves mention, having raised herself almost completely alone from infancy on Alternia, a freaking Death World.
This would be amazing already without the fact that she is blind.
GamzeeMakara has recently taken things to a new level with the revelation that he has managed to survive through will alone, throughout every timeline, including ones in which a psychic shriek was emitted that is fatal to his entire species. He's also still moving in the alpha timeline, despite taking 5 minutes worth of automatic fire from Caliborn's Machine Gun.
Vriska is obsessed with being the most important character of the plot, essentially orchestrating (Or at least so she thinks) every major event of the Alpha timeline. Even after she died, she's still hell bent in being the one to defeat lord English by rallying up an army of ghosts in the void between universes. Taking this trope to its logical extent, she will even directly challenge the narrator/writer of the comic psychically in order to get back in the spotlight and finish her Story Arc properly.
The canadian lumberjack in Antihero For Hire certainly adheres to the trope strongly, as seen here. Some of MANTIS's agents, especially the elites, qualify.
El Goonish Shive: Nanase was the only one able to protect Ellen from the Knight Templar trying to kill her, but the only thing she could do was summon a doll-sized version of herself at Ellen's position, though she could still throw full-powered punches in that form. She would get a few hits in, and then the Knight Templar would destroy the doll, which'd give her damaging feedback. So she'd summon another one...and another....and another...
Dominic Deegan has The Infernomancer. No matter if he's devestated by holy magic, blasted by chaos infused black magic, banished to an alternate dimension full of eldritch abominations, or sent directly to hell, he just... Doesn't... Die...
Anne from Sunstone puts a startlingly large amount of time and effort into getting Alan to cross dress. This infliction was caught by the fans when Sejic hinted this would actually happen after an outrageous amount of page views.